Abstract: The 3D construction scheme simulation platform aims to give full play to the effectiveness of the existing 3D design results and extend the value of 3D results to the construction stage, it can assist in carrying out simulation exercises and review clarifications for construction scheme with significant risk, strengthen process quality control and enhance risk prevention awareness. The platform is developed based on Unity3D engine, the GIM is simplified by similarity algorithm. It supports the full workflow with the help of high-definition rendering pipeline, and the task processes management is realized through TaskCore. The platform adopts modular design, 7 types of construction schemes have been realized, and it has been applied in Yazhong-Jiangxi ±800 kV DC transmission project. It meets the application requirements of scenes such as training, exercise, and assessment. The application of the platform has effectively improved the professional skills and safety awareness of construction operators, and it will be of positive significance to further explore how to improve the management level of power grid engineering construction by means of informatization.